Apparatus for ascertaining the hardness of metal parts



L PARTS.

1920. Patented Sept. 28, 1920.

/ Il/In m En -E55 E. SCHNEIDER. APPARATUS FOR ASCERTAINING THE HARDNESS 0F META APPLICATION FILED JUNE 16, 1919. RENEWED AUG. 12,

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EUGENE SCHNEIDER, 0F PARIS, FRANCE, ASSIGNOR TOISGHNEIDER & CIR, OF PARIS,

FRANCE, A LIMITED J OINT-STOCK COMPANY OF FRANCE.

APPARATUS FOR ASCERTAINING THE HARDNESS OF METAL PARTS.

o igi l application filed August 21, 1918, Serial No. 250,862. Divided and this application filed June 16 Specification of Letters Patent.

1919, Serial No. 304,650. Renewed August 12, 1920. Serial No. 403,152.

T 0 all whom it may concern:

Be it known that I, EUGENE SCHNEIDER, a citizen of the Republic ofFra-nce, and a resident of Paris France, have invented a new and useful improvement in an Appa-s ratus for ascertaining the Hardness of: Metal Parts, which invention is fully set conditions at two opposite points including between them the thickness of the article to produce indentations, thereby furnishing indications of the degree of homogeneity of the metal in the region where the test has i been made.

Thepresent invention relates to a constructional form of apparatus for carrying out the above method and is designed more particularly for testing the bottom end wall of a hollow article, such as for instance the base of a projectile.

In order that the invention may be more readily understood, reference is had to the accompanying drawings in which Figure 1 is a vertical sectional view of the apparatus embodying my improvements and Fig. 2 is a plan view of a detail.

. In the drawings M is a platform carried by rods m slidable in a foot-plate M which may be fixed at a varying distance from the bed L. foot-plate M and the platform M and serve to balance practically the weight of the article under test. E, are ball holders. The lower ball holder E is mounted on the end of an arm,@ fixed to the foot-plate M in such a manner that the ball holder shall be capable of projecting through a central orifice in the footplate. The upper ball holder E is mounted on the lower end of an arm N which is pivoted by means of a pin a to a screw N. This screw N is adapted to work in a threaded opening in a lever shown in cross section at (J ig. l) which is adapted to be tulcrumiiad at one end and at the M are springs bearing against the V opposite end is adapted to receive the power required for producing the simultaneous indentations.

The apparatus is completed by a simple means which allows of bringing diiferent regions of the bottom of the hollow article between the two jaws of the pincers, the latter occupying an eccentric position relatlvely to the axis of the said article as shown. To a clamping ring V locatedat a sultable point in the length of the projectlle there is jointed a lever V adapted to bear upon the outer surface of the shell. The power required for moving the shell around its axis by means of the lever V is reduced by arranging the latter to bear by means of a roller V upon a circular track V located on the framing of the apparatus.

The shell is guided vertically for instance by means ofa suitably calibrated sleeve X.

One or more guiding rollers X whose axles are mounted on the framing are provided for the purpose of guiding the shell so as to keep it upright for centeringv it in the sleeve X in placing the shell upon the supporting platform.

After the external and internal indentations have been produced simultaneously by means of the improved apparatus, they may be produced in relief in a plastic material, by dismoun'ting the ball holders lI-E and replacing them by dies, that is to say, by

similar holders bearing a plate of lead or other plastic material. The pressure for effecting the simultaneous moldings of the two indentations may be produced by means of the same weight on a lever, acting if desired for a shorter time, or by means of a suitably reduced weight.

It is to be understood that the improved apparatus for producing and then observing simultaneous indentations formed in varying regions of a test article under identical conditions of pressure, temperature and duration of indentation, while furnishing on one hand valuable indications as to the constitution of the test article, are also capable of furnishing at the same time indications as to the apparatus for tempering or treating, or as to the nature of the metal; if the operations are carried out with. a standard test piece or on a verified.

test piece, This invention can thus furnish simple and practical means for regulating a manufacture, because it allows of modifyingaccording to the indications obtained,

combination of oppositely disposed indenting members one of which is movable and the other of which is stationary,a yield-' ported operatingdeve'r for gripping and shifting the article under said indenting ingly supported platform having an open ing for receiving one of said indenting members and for normally supporting the article to be tested and means for apply ng indenting pressure to said article through said movable indenting member.

2. In'apparatus fortesting hardness, the

which is stationary, a. resiliently supported platform having an open:

ing for receiving one of said members and for supporting the article to be tested, means for shifting said article under said indenting members and means for applying indenting pressure to said article through said movableindenting member.

3. In apparatus for testing hardness, the

combination of oppositely disposed indentng members one of whlch s movable and the other of which is stationary, 'a resiliently supported platform having an opening for receiving one of said indenting members and for supporting the article to 'betested, a clamping collar .for receiving said article and adapted'to'shiftjthe article under said indenting members and means for applying indenting pressure to said article through said movable indenting member. 4. In apparatusfor testing hardness, the

combination, of oppositely disposed indent. 'ingmembers, one of which ,is movable and the other of which is stationary, a resiliently supported platform having an opening for receiving one of said indenting members. and for supporting the articleto be tested, a clamping collar for receiving said-articleand provided with a roller-supmembers, and means for applying indenting pressure to said article through said movable indenting member.

5 In apparatus for testing hardness, the r combination of oppositely disposed indenting members one ofwhich is-movable and the other of which is stationary, a yieldingly supported platform having an opening' for receiving ,one of said indenting members and for normally supporting the 7 article to be tested, means fora'djusting the height of said platform, a clamping collar adapted to receive said article and having a roller supported operating' lever 'for gripping and shifting the article under said indenting members and means for applying indentingpressure to-said article through' said movable indenting member.

6. In apparatus as defined in claim '5,

wherein means are provided for guiding and centering the article to be tested.

' EUGENE I SCHNEIDER.

'VVitnesses: I i V r Louis GARDET, HENRI MQNIN. 

